Aibell’s Garb and Patterns — Instructions, documentation, patterns & more. Specific regions & eras include: Roman, 5th-10th c. Irish; 10th-11th c. English; 15th c. Italian; and 12th c. bliaut. Also cloak patterns.
Albanach.org — “The history of Highland dress”. Lots of articles and info about early (pre-17th century) Highland dress and history: kilts, leine, tartans, Scottish saints, songs, and more.
Clothing of the Ancient Celts — The original website no longer exists, but is preserved on the Internet Archive. Several articles covering clothing of the Celts from the early Iron Age through to the 18th century.
Mara Riley’s Costume Page — From the website: “Dedicated to 17th & 18th century costume in Europe and the American colonies.” Site has patterns and instructions for making various clothing items; essays on costume of this era; and photos of extant garments. Has some info on late 17th & 18th c. Scottish Highland clothing
Medieval Scotland — By Sharon Krossa. A collection of articles and resources about Scotland between 500 - 1603 A.D.